StevenJL · December 17, 2017 10:46
diff --git a/eager_load.rb b/eager_load.rb
 # Eager-load all users' posts with `includes`
 users = User.includes(:posts)

 users.each do |user|
  user.posts
 end

 # This will only run 2 queries.
 # SELECT * FROM users;
 # SELECT * FROM posts WHERE posts.user_ids IN (1,2,3,4,....,n);
	# Eager-load all users' posts with `includes`
	users = User.includes(:posts)

	users.each do \|user\|
	user.posts
	end

	# This will only run 2 queries.
	# SELECT * FROM users;
	# SELECT * FROM posts WHERE posts.user_ids IN (1,2,3,4,....,n);